CONTROL DEVICE FOR A HYBRID VEHICLE, AND A CONTROL METHOD

摘要

A hybrid vehicle includes an engine and a motor each for generating vehicle driving power. An operation region indicated by rotational speed (Ne) and torque (Te) of the engine includes: an normal region (305) in which a fuel injection amount is calculated in accordance with a stoichiometric air-fuel ratio; and an OT amount increase region (310) in which an amount of fuel is increased to exceed the fuel injection amount that is in accordance with the stoichiometric air-fuel ratio so as to suppress temperature increase of a catalyst provided in an exhausting system of the engine. A control device for the hybrid vehicle calculates a total required power of the hybrid vehicle in accordance with the vehicle state, and determines an engine operation point in accordance with the total required power. When the engine operation point (P1) is in the OT amount increase region (310), the engine operation point (P2) is changed to fall within the normal region (305) by decreasing the engine output power. An output power of the motor is determined to compensate the decrease of the engine output power for the change of the engine operation point and secure the total required power.